namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <time.h>
  33 #include <sys/wait.h>
  34 #include <sys/stat.h>
  35
  36 #include "list.h"
  37 #include "udev.h"
  38 #include "udev_version.h"
  39 #include "logging.h"
  40 #include "namedev.h"
  41 #include "libsysfs/libsysfs.h"
  42 #include "klibc_fixups.h"
  43
  44 LIST_HEAD(config_device_list);
  45 LIST_HEAD(perm_device_list);
  46
  47 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  48 static int strcmp_pattern(const char *p, const char *s)
  49 {
  50         if (s[0] == '\0') {
  51                 while (p[0] == '*')
  52                         p++;
  53                 return (p[0] != '\0');
  54         }
  55         switch (p[0]) {
  56         case '[':
  57                 {
  58                         int not = 0;
  59                         p++;
  60                         if (p[0] == '!') {
  61                                 not = 1;
  62                                 p++;
  63                         }
  64                         while ((p[0] != '\0') && (p[0] != ']')) {
  65                                 int match = 0;
  66                                 if (p[1] == '-') {
  67                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  68                                                 match = 1;
  69                                         p += 3;
  70                                 } else {
  71                                         match = (p[0] == s[0]);
  72                                         p++;
  73                                 }
  74                                 if (match ^ not) {
  75                                         while ((p[0] != '\0') && (p[0] != ']'))
  76                                                 p++;
  77                                         if (p[0] == ']')
  78                                                 return strcmp_pattern(p+1, s+1);
  79                                 }
  80                         }
  81                 }
  82                 break;
  83         case '*':
  84                 if (strcmp_pattern(p, s+1))
  85                         return strcmp_pattern(p+1, s);
  86                 return 0;
  87         case '\0':
  88                 if (s[0] == '\0') {
  89                         return 0;
  90                 }
  91                 break;
  92         default:
  93                 if ((p[0] == s[0]) || (p[0] == '?'))
  94                         return strcmp_pattern(p+1, s+1);
  95                 break;
  96         }
  97         return 1;
  98 }
  99
 100 #define copy_var(a, b, var)             \
 101         if (b->var)                     \
 102                 a->var = b->var;
 103
 104 #define copy_string(a, b, var)          \
 105         if (strlen(b->var))             \
 106                 strcpy(a->var, b->var);
 107
 108 int add_perm_dev(struct perm_device *new_dev)
 109 {
 110         struct perm_device *dev;
 111         struct perm_device *tmp_dev;
 112
 113         /* update the values if we already have the device */
 114         list_for_each_entry(dev, &perm_device_list, node) {
 115                 if (strcmp_pattern(new_dev->name, dev->name))
 116                         continue;
 117                 copy_var(dev, new_dev, mode);
 118                 copy_string(dev, new_dev, owner);
 119                 copy_string(dev, new_dev, group);
 120                 return 0;
 121         }
 122
 123         /* not found, add new structure to the perm list */
 124         tmp_dev = malloc(sizeof(*tmp_dev));
 125         if (!tmp_dev)
 126                 return -ENOMEM;
 127         memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
 128         list_add_tail(&tmp_dev->node, &perm_device_list);
 129         //dump_perm_dev(tmp_dev);
 130         return 0;
 131 }
 132
 133 static struct perm_device *find_perm(char *name)
 134 {
 135         struct perm_device *perm;
 136
 137         list_for_each_entry(perm, &perm_device_list, node) {
 138                 if (strcmp_pattern(perm->name, name))
 139                         continue;
 140                 return perm;
 141         }
 142         return NULL;
 143 }
 144
 145 static mode_t get_default_mode(void)
 146 {
 147         mode_t mode = 0600;     /* default to owner rw only */
 148
 149         if (strlen(default_mode_str) != 0)
 150                 mode = strtol(default_mode_str, NULL, 8);
 151
 152         return mode;
 153 }
 154
 155 static char *get_default_owner(void)
 156 {
 157         if (strlen(default_owner_str) == 0)
 158                 strncpy(default_owner_str, "root", OWNER_SIZE);
 159
 160         return default_owner_str;
 161 }
 162
 163 static char *get_default_group(void)
 164 {
 165         if (strlen(default_group_str) == 0)
 166                 strncpy(default_group_str, "root", GROUP_SIZE);
 167
 168         return default_group_str;
 169 }
 170
 171 static void apply_format(struct udevice *udev, unsigned char *string)
 172 {
 173         char temp[NAME_SIZE];
 174         char temp1[NAME_SIZE];
 175         char *tail;
 176         char *pos;
 177         char *pos2;
 178         char *pos3;
 179         int num;
 180
 181         pos = string;
 182         while (1) {
 183                 num = 0;
 184                 pos = strchr(pos, '%');
 185
 186                 if (pos) {
 187                         pos[0] = '\0';
 188                         tail = pos+1;
 189                         if (isdigit(tail[0])) {
 190                                 num = (int) strtoul(&pos[1], &tail, 10);
 191                                 if (tail == NULL) {
 192                                         dbg("format parsing error '%s'", pos+1);
 193                                         break;
 194                                 }
 195                         }
 196                         strfieldcpy(temp, tail+1);
 197
 198                         switch (tail[0]) {
 199                         case 'b':
 200                                 if (strlen(udev->bus_id) == 0)
 201                                         break;
 202                                 strcat(pos, udev->bus_id);
 203                                 dbg("substitute bus_id '%s'", udev->bus_id);
 204                                 break;
 205                         case 'k':
 206                                 if (strlen(udev->kernel_name) == 0)
 207                                         break;
 208                                 strcat(pos, udev->kernel_name);
 209                                 dbg("substitute kernel name '%s'", udev->kernel_name);
 210                                 break;
 211                         case 'n':
 212                                 if (strlen(udev->kernel_number) == 0)
 213                                         break;
 214                                 strcat(pos, udev->kernel_number);
 215                                 dbg("substitute kernel number '%s'", udev->kernel_number);
 216                                 break;
 217                         case 'm':
 218                                 sprintf(pos, "%u", udev->minor);
 219                                 dbg("substitute minor number '%u'", udev->minor);
 220                                 break;
 221                         case 'M':
 222                                 sprintf(pos, "%u", udev->major);
 223                                 dbg("substitute major number '%u'", udev->major);
 224                                 break;
 225                         case 'c':
 226                                 if (strlen(udev->program_result) == 0)
 227                                         break;
 228                                 if (num) {
 229                                         /* get part of return string */
 230                                         strncpy(temp1, udev->program_result, sizeof(temp1));
 231                                         pos2 = temp1;
 232                                         while (num) {
 233                                                 num--;
 234                                                 pos3 = strsep(&pos2, " ");
 235                                                 if (pos3 == NULL) {
 236                                                         dbg("requested part of result string not found");
 237                                                         break;
 238                                                 }
 239                                         }
 240                                         if (pos3) {
 241                                                 strcat(pos, pos3);
 242                                                 dbg("substitute part of result string '%s'", pos3);
 243                                         }
 244                                 } else {
 245                                         strcat(pos, udev->program_result);
 246                                         dbg("substitute result string '%s'", udev->program_result);
 247                                 }
 248                                 break;
 249                         case '%':
 250                                 strcat(pos, "%");
 251                                 pos++;
 252                                 break;
 253                         default:
 254                                 dbg("unknown substitution type '%%%c'", pos[1]);
 255                                 break;
 256                         }
 257                         strcat(string, temp);
 258                 } else
 259                         break;
 260         }
 261 }
 262
 263 static struct bus_file {
 264         char *bus;
 265         char *file;
 266 } bus_files[] = {
 267         { .bus = "scsi",        .file = "vendor" },
 268         { .bus = "usb",         .file = "idVendor" },
 269         { .bus = "usb-serial",  .file = "detach_state" },
 270         { .bus = "ide",         .file = "detach_state" },
 271         { .bus = "pci",         .file = "vendor" },
 272         {}
 273 };
 274
 275 #define SECONDS_TO_WAIT_FOR_FILE        10
 276 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 277 {
 278         /* sleep until we see the file for this specific bus type show up this
 279          * is needed because we can easily out-run the kernel in looking for
 280          * these files before the paticular subsystem has created them in the
 281          * sysfs tree properly.
 282          *
 283          * And people thought that the /sbin/hotplug event system was going to
 284          * be slow, poo on you for arguing that before even testing it...
 285          */
 286         struct bus_file *b = &bus_files[0];
 287         struct sysfs_attribute *tmpattr;
 288         int loop;
 289
 290         while (1) {
 291                 if (b->bus == NULL)
 292                         break;
 293                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 294                         tmpattr = NULL;
 295                         loop = SECONDS_TO_WAIT_FOR_FILE;
 296                         while (loop--) {
 297                                 dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 298                                 tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 299                                 if (tmpattr) {
 300                                         /* found it! */
 301                                         goto exit;
 302                                 }
 303                                 /* sleep to give the kernel a chance to create the file */
 304                                 sleep(1);
 305                         }
 306                         dbg("timed out waiting for '%s' file, continuing on anyway...", b->file);
 307                         goto exit;
 308                 }
 309                 b++;
 310         }
 311         dbg("did not find bus type '%s' on list of bus_id_files, contact greg@kroah.com", sysfs_device->bus);
 312 exit:
 313         return; /* here to prevent compiler warning... */
 314 }
 315
 316 static int execute_program(char *path, char *value, int len)
 317 {
 318         int retval;
 319         int res;
 320         int status;
 321         int fds[2];
 322         pid_t pid;
 323         int value_set = 0;
 324         char buffer[256];
 325         char *pos;
 326         char *args[PROGRAM_MAXARG];
 327         int i;
 328
 329         dbg("executing '%s'", path);
 330         retval = pipe(fds);
 331         if (retval != 0) {
 332                 dbg("pipe failed");
 333                 return -1;
 334         }
 335         pid = fork();
 336         switch(pid) {
 337         case 0:
 338                 /* child */
 339                 close(STDOUT_FILENO);
 340                 dup(fds[1]);    /* dup write side of pipe to STDOUT */
 341                 if (strchr(path, ' ')) {
 342                         /* exec with arguments */
 343                         pos = path;
 344                         for (i=0; i < PROGRAM_MAXARG-1; i++) {
 345                                 args[i] = strsep(&pos, " ");
 346                                 if (args[i] == NULL)
 347                                         break;
 348                         }
 349                         if (args[i]) {
 350                                 dbg("too many args - %d", i);
 351                                 args[i] = NULL;
 352                         }
 353                         retval = execv(args[0], args);
 354                 } else {
 355                         retval = execv(path, main_argv);
 356                 }
 357                 dbg("child execve failed");
 358                 exit(1);
 359         case -1:
 360                 dbg("fork failed");
 361                 return -1;
 362         default:
 363                 /* parent reads from fds[0] */
 364                 close(fds[1]);
 365                 retval = 0;
 366                 while (1) {
 367                         res = read(fds[0], buffer, sizeof(buffer) - 1);
 368                         if (res <= 0)
 369                                 break;
 370                         buffer[res] = '\0';
 371                         if (res > len) {
 372                                 dbg("result len %d too short", len);
 373                                 retval = -1;
 374                         }
 375                         if (value_set) {
 376                                 dbg("result value already set");
 377                                 retval = -1;
 378                         } else {
 379                                 value_set = 1;
 380                                 strncpy(value, buffer, len);
 381                                 pos = value + strlen(value)-1;
 382                                 if (pos[0] == '\n')
 383                                 pos[0] = '\0';
 384                                 dbg("result is '%s'", value);
 385                         }
 386                 }
 387                 close(fds[0]);
 388                 res = wait(&status);
 389                 if (res < 0) {
 390                         dbg("wait failed result %d", res);
 391                         retval = -1;
 392                 }
 393
 394                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 395                         dbg("exec program status 0x%x", status);
 396                         retval = -1;
 397                 }
 398         }
 399         return retval;
 400 }
 401
 402 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 403 {
 404         struct sysfs_attribute *tmpattr = NULL;
 405         char *c;
 406
 407         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 408                 return -ENODEV;
 409
 410         dbg("look for device attribute '%s'", pair->file);
 411         /* try to find the attribute in the class device directory */
 412         tmpattr = sysfs_get_classdev_attr(class_dev, pair->file);
 413         if (tmpattr)
 414                 goto label_found;
 415
 416         /* look in the class device directory if present */
 417         if (sysfs_device) {
 418                 tmpattr = sysfs_get_device_attr(sysfs_device, pair->file);
 419                 if (tmpattr)
 420                         goto label_found;
 421         }
 422         return -ENODEV;
 423
 424 label_found:
 425         c = tmpattr->value + strlen(tmpattr->value)-1;
 426         if (*c == '\n')
 427                 *c = 0x00;
 428         dbg("compare attribute '%s' value '%s' with '%s'",
 429                   pair->file, tmpattr->value, pair->value);
 430         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 431                 return -ENODEV;
 432
 433         dbg("found matching attribute '%s' with value '%s'",
 434             pair->file, pair->value);
 435         return 0;
 436 }
 437
 438 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 439 {
 440         struct sysfs_pair *pair;
 441         int i;
 442
 443         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 444                 pair = &dev->sysfs_pair[i];
 445                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 446                         break;
 447                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 448                         dbg("sysfs attribute doesn't match");
 449                         return -ENODEV;
 450                 }
 451         }
 452
 453         return 0;
 454 }
 455
 456 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 457 {
 458         char path[SYSFS_PATH_MAX];
 459         int found;
 460         char *temp = NULL;
 461
 462         /* we have to have a sysfs device for ID to work */
 463         if (!sysfs_device)
 464                 return -ENODEV;
 465
 466         found = 0;
 467         strfieldcpy(path, sysfs_device->path);
 468         temp = strrchr(path, '/');
 469         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 470         if (strstr(temp, dev->id) != NULL) {
 471                 found = 1;
 472         } else {
 473                 *temp = 0x00;
 474                 temp = strrchr(path, '/');
 475                 dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 476                 if (strstr(temp, dev->id) != NULL)
 477                         found = 1;
 478         }
 479         if (!found) {
 480                 dbg("id doesn't match");
 481                 return -ENODEV;
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 488 {
 489         char path[SYSFS_PATH_MAX];
 490         int found;
 491         char *temp = NULL;
 492
 493         /* we have to have a sysfs device for PLACE to work */
 494         if (!sysfs_device)
 495                 return -ENODEV;
 496
 497         found = 0;
 498         strfieldcpy(path, sysfs_device->path);
 499         temp = strrchr(path, '/');
 500         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 501         if (strstr(temp, dev->place) != NULL) {
 502                 found = 1;
 503         } else {
 504                 *temp = 0x00;
 505                 temp = strrchr(path, '/');
 506                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 507                 if (strstr(temp, dev->place) != NULL)
 508                         found = 1;
 509         }
 510         if (!found) {
 511                 dbg("place doesn't match");
 512                 return -ENODEV;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 519 {
 520         struct sysfs_device *sysfs_device;
 521         struct sysfs_class_device *class_dev_parent;
 522         struct timespec tspec;
 523         int loop;
 524
 525         /* Figure out where the device symlink is at.  For char devices this will
 526          * always be in the class_dev->path.  But for block devices, it's different.
 527          * The main block device will have the device symlink in it's path, but
 528          * all partitions have the symlink in its parent directory.
 529          * But we need to watch out for block devices that do not have parents, yet
 530          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 531          * symlink yet.  We do sit and spin on waiting for them right now, we should
 532          * possibly have a whitelist for these devices here...
 533          */
 534         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 535         if (class_dev_parent)
 536                 dbg("Really a partition");
 537
 538         tspec.tv_sec = 0;
 539         tspec.tv_nsec = 10000000;  /* sleep 10 millisec */
 540         loop = 10;
 541         while (loop--) {
 542                 nanosleep(&tspec, NULL);
 543                 if (class_dev_parent)
 544                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 545                 else
 546                         sysfs_device = sysfs_get_classdev_device(class_dev);
 547
 548                 if (sysfs_device != NULL)
 549                         goto device_found;
 550         }
 551         dbg("timed out waiting for device symlink, continuing on anyway...");
 552
 553 device_found:
 554         /* We have another issue with just the wait above - the sysfs part of
 555          * the kernel may not be quick enough to have created the link to the
 556          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 557          * will not contain the actual bus name :(
 558          *
 559          * Libsysfs now provides a new API sysfs_get_device_bus(), so use it
 560          * if needed
 561          */
 562         if (sysfs_device) {
 563                 if (sysfs_device->bus[0] != '\0')
 564                         goto bus_found;
 565
 566                 loop = 10;
 567                 tspec.tv_nsec = 10000000;
 568                 while (loop--) {
 569                         nanosleep(&tspec, NULL);
 570                         sysfs_get_device_bus(sysfs_device);
 571
 572                         if (sysfs_device->bus[0] != '\0')
 573                                 goto bus_found;
 574                 }
 575                 dbg("timed out waiting to find the device bus, continuing on anyway");
 576                 goto exit;
 577 bus_found:
 578                 dbg("device %s is registered with bus '%s'",
 579                                 sysfs_device->name, sysfs_device->bus);
 580         }
 581 exit:
 582         return sysfs_device;
 583 }
 584
 585 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 586 {
 587         while (1) {
 588                 /* check for matching bus value */
 589                 if (dev->bus[0] != '\0') {
 590                         if (sysfs_device == NULL) {
 591                                 dbg("device has no bus");
 592                                 goto try_parent;
 593                         }
 594                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 595                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 596                                 dbg(FIELD_BUS " is not matching");
 597                                 goto try_parent;
 598                         } else {
 599                                 dbg(FIELD_BUS " matches");
 600                         }
 601                 }
 602
 603                 /* check for matching kernel name*/
 604                 if (dev->kernel[0] != '\0') {
 605                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 606                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 607                                 dbg(FIELD_KERNEL " is not matching");
 608                                 goto try_parent;
 609                         } else {
 610                                 dbg(FIELD_KERNEL " matches");
 611                         }
 612                 }
 613
 614                 /* check for matching bus id */
 615                 if (dev->id[0] != '\0') {
 616                         dbg("check " FIELD_ID);
 617                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 618                                 dbg(FIELD_ID " is not matching");
 619                                 goto try_parent;
 620                         } else {
 621                                 dbg(FIELD_ID " matches");
 622                         }
 623                 }
 624
 625                 /* check for matching place of device */
 626                 if (dev->place[0] != '\0') {
 627                         dbg("check " FIELD_PLACE);
 628                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 629                                 dbg(FIELD_PLACE " is not matching");
 630                                 goto try_parent;
 631                         } else {
 632                                 dbg(FIELD_PLACE " matches");
 633                         }
 634                 }
 635
 636                 /* check for matching sysfs pairs */
 637                 if (dev->sysfs_pair[0].file[0] != '\0') {
 638                         dbg("check " FIELD_SYSFS " pairs");
 639                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 640                                 dbg(FIELD_SYSFS " is not matching");
 641                                 goto try_parent;
 642                         } else {
 643                                 dbg(FIELD_SYSFS " matches");
 644                         }
 645                 }
 646
 647                 /* execute external program */
 648                 if (dev->program[0] != '\0') {
 649                         dbg("check " FIELD_PROGRAM);
 650                         apply_format(udev, dev->program);
 651                         if (execute_program(dev->program, udev->program_result, NAME_SIZE) != 0) {
 652                                 dbg(FIELD_PROGRAM " returned nozero");
 653                                 goto try_parent;
 654                         } else {
 655                                 dbg(FIELD_PROGRAM " returned successful");
 656                         }
 657                 }
 658
 659                 /* check for matching result of external program */
 660                 if (dev->result[0] != '\0') {
 661                         dbg("check for " FIELD_RESULT
 662                             " dev->result='%s', udev->program_result='%s'",
 663                             dev->result, udev->program_result);
 664                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 665                                 dbg(FIELD_RESULT " is not matching");
 666                                 goto try_parent;
 667                         } else {
 668                                 dbg(FIELD_RESULT " matches");
 669                         }
 670                 }
 671
 672                 /* Yeah, we matched! */
 673                 return 0;
 674
 675 try_parent:
 676                 dbg("try parent sysfs device");
 677                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 678                 if (sysfs_device == NULL)
 679                         return -ENODEV;
 680                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 681                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 682                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 683         }
 684
 685 }
 686
 687 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 688 {
 689         struct sysfs_device *sysfs_device = NULL;
 690         struct config_device *dev;
 691         struct perm_device *perm;
 692         char *pos;
 693
 694         udev->mode = 0;
 695
 696         /* find the sysfs_device associated with this class device */
 697         sysfs_device = get_sysfs_device(class_dev);
 698         if (sysfs_device) {
 699                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 700                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 701                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 702                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 703                 wait_for_device_to_initialize(sysfs_device);
 704         } else {
 705                 dbg("class_dev->name = '%s'", class_dev->name);
 706         }
 707
 708         strfieldcpy(udev->kernel_name, class_dev->name);
 709
 710         /* get kernel number */
 711         pos = class_dev->name + strlen(class_dev->name);
 712         while (isdigit(*(pos-1)))
 713                 pos--;
 714         strfieldcpy(udev->kernel_number, pos);
 715         dbg("kernel_number='%s'", udev->kernel_number);
 716
 717         /* look for a matching rule to apply */
 718         list_for_each_entry(dev, &config_device_list, node) {
 719                 dbg("process rule");
 720                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 721                         if (dev->name[0] == '\0') {
 722                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 723                                      udev_rules_filename, dev->config_line, udev->kernel_name);
 724                                 return -1;
 725                         }
 726
 727                         info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 728                              udev_rules_filename, dev->config_line, udev->kernel_name, dev->name);
 729                         strfieldcpy(udev->name, dev->name);
 730                         strfieldcpy(udev->symlink, dev->symlink);
 731                         goto found;
 732                 }
 733         }
 734
 735         /* no rule was found so we use the kernel name */
 736         strfieldcpy(udev->name, class_dev->name);
 737         goto done;
 738
 739 found:
 740         /* substitute placeholder */
 741         apply_format(udev, udev->name);
 742         apply_format(udev, udev->symlink);
 743
 744 done:
 745         perm = find_perm(udev->name);
 746         if (perm) {
 747                 udev->mode = perm->mode;
 748                 strfieldcpy(udev->owner, perm->owner);
 749                 strfieldcpy(udev->group, perm->group);
 750         } else {
 751                 /* no matching perms found :( */
 752                 udev->mode = get_default_mode();
 753                 strncpy(udev->owner, get_default_owner(), OWNER_SIZE);
 754                 strncpy(udev->group, get_default_group(), GROUP_SIZE);
 755         }
 756         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 757             udev->name, udev->owner, udev->group, udev->mode);
 758
 759         return 0;
 760 }
 761
 762 int namedev_init(void)
 763 {
 764         int retval;
 765
 766         retval = namedev_init_rules();
 767         if (retval)
 768                 return retval;
 769
 770         retval = namedev_init_permissions();
 771         if (retval)
 772                 return retval;
 773
 774         dump_config_dev_list();
 775         dump_perm_dev_list();
 776         return retval;
 777 }